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From Apache Wiki <>
Subject [Httpd Wiki] Update of "RewriteMisc" by RichBowen
Date Fri, 15 Jan 2010 14:36:55 GMT
Dear Wiki user,

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The "RewriteMisc" page has been changed by RichBowen.


  The LA-U syntax does a look-ahead to find out what the value of a particular variable will
be later on. This requires a sub-request, and that results in something of a performance hit.
Consider using the ScriptLog directive instead. However, the technique used here can be used
for a larger class of problems, when a variable isn't available at request time, but will
be later on.
- }}}

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